CN101673562A - Optical disc and recording/reproducing method and apparatus for the optical disc - Google Patents
Optical disc and recording/reproducing method and apparatus for the optical disc Download PDFInfo
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- CN101673562A CN101673562A CN200910002289A CN200910002289A CN101673562A CN 101673562 A CN101673562 A CN 101673562A CN 200910002289 A CN200910002289 A CN 200910002289A CN 200910002289 A CN200910002289 A CN 200910002289A CN 101673562 A CN101673562 A CN 101673562A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00772—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track on record carriers storing information in the form of optical interference patterns, e.g. holograms
- G11B7/00781—Auxiliary information, e.g. index marks, address marks, pre-pits, gray codes
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/083—Disposition or mounting of heads or light sources relatively to record carriers relative to record carriers storing information in the form of optical interference patterns, e.g. holograms
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
- G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24044—Recording layers for storing optical interference patterns, e.g. holograms; for storing data in three dimensions, e.g. volume storage
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
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- Optical Recording Or Reproduction (AREA)
- Holo Graphy (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
The invention provides an optical disc, and a recording/reproducing method and a recording/reproducing apparatus for the optical disc. The optical disc includes an optical information storage layer, including a layer format region and a user data region. The layer format region is divided into virtual layers that are disposed at different depths. The virtual layers include layer information to distinguish the virtual layers from one another.
Description
The application requires the right of priority at the 10-2008-0089330 korean patent application of Korea S Department of Intellectual Property submission on September 10th, 2008, and this application all is disclosed in this for reference.
Technical field
The present invention relates to a kind of optical recording/reproducing dish, equipment and method.
Background technology
The information storage capacity of optical information storage medium (following will be called CD) improves constantly.CD is classified as compact disk (CD), digital versatile disc (DVD), high definition (HD) DVD, Blu-ray disc (BD) etc.
Recently, the holographic information memory technology has attracted a lot of attentions.Holographic optical disk is for recording layer usability luminescent material (such as sensitization mineral crystal or photopolymer), and with form canned data in photosensitive material of interference figure.Form interference figure by coherent laser beam (that is, reference beam and signal beams).The reference beam similar to the reference beam that is used to write down is radiated the interference figure of holographic optical disk, and produces the signal beams that comprises canned data.
These holographic information memory technologies can be divided into the body holography of recorded page by page/information reproduction and use little holography of single-bit microhologram recoding/reproduction information.Described body holography can be handled information capacious simultaneously, but uses point-device tunable optical system because described body is holographic, so be difficult to realize its commerce is turned to information-storing device in the face of ordinary consumer.
Little holography comprises by causing that the interference between the light beam of two optically focused on the focus of holographic information storage medium forms meticulous interference figure (microhologram).In storage medium, can on identical plane, form a plurality of interference figures to form recording layer.In storage medium, can form a plurality of recording layers with different depth, thereby on information storage medium with the three dimensional constitution recorded information.
Pluratity of recording layers has increased the memory capacity of little holography.Tradition multiplayer optical disk (such as BD) comprises the reflectance coating that recording layer is distinguished from each other from physically by the light intensity signal of use reflection and the polarity of signal, to form optical focus in the recording layer of expectation.
Compare with traditional multiplayer optical disk, holographic optical disk does not comprise the reflectance coating that is used to distinguish recording layer.Therefore, be difficult in the expectation recording layer of holographic optical disk and form optical focus, and need study the recording/reproducing method that is used for holographic optical disk.
Summary of the invention
This instruction provide a kind of can be in a plurality of recording layers the CD of recorded information and the disc recording method and apparatus that is used for described CD.
This instruction provides a kind of CD that comprises the optical information accumulation layer with layer format region and user data area.Layer format region comprises a plurality of virtual levels that are arranged in thickness direction, and record is used for layer information that a plurality of virtual levels are distinguished from each other in each virtual level.
According to the each side of this instruction, can form the optical information accumulation layer by the photosensitive material that can carry out holographic recording.
According to the each side of this instruction, can a layer format region partly be set in the inner circumferential portion and the outermost circumference of CD.
According to the each side of this instruction, in the optical information accumulation layer, do not form reflectance coating.
Each side according to this instruction, topmost portion and the corresponding virtual level of lowermost part with the optical information accumulation layer in a plurality of virtual levels can be barren zones, and can write down indication and incite somebody to action the not information of executive logging at the row that extends to user data area from barren zone in barren zone.
According to the each side of this instruction, provide a kind of disc recording method that is used to comprise the optical information accumulation layer.Described recording/reproducing method comprises: layer format region and user data area are set in the optical information accumulation layer, with data recording before the user data area, in the thickness direction of optical information accumulation layer, specify a plurality of positions as a plurality of virtual levels in the layer format region, and record is used to distinguish the layer information of virtual level in each of described a plurality of virtual levels.
According to the each side of this instruction, a layer format region can be set according to the off-centre of CD.
According to the each side of this instruction, a plurality of layers of format region can be set.
Each side according to this instruction, described recording/reproducing method also can comprise: specify from virtual level and extend to position on the row of user data area as a plurality of recording sections, and by according to the corresponding virtual level of each recording section in the layer information Control optical focus that writes down data are recorded in described a plurality of recording section.
According to the each side of this instruction, described recording/reproducing method also can comprise: by according to the corresponding virtual level of each recording section in the layer information Control optical focus that writes down reproduce the data that write down in the recording section.
According to the each side of this instruction, when the degree of depth of mobile optical focus in the optical information accumulation layer, for record data in recording section or reproduce the information of record, can in layer format region, carry out described mobile.
According to the each side of this instruction, provide a kind of disc recording equipment that is used to comprise the optical information accumulation layer.Described recording/reproducing apparatus comprises: hologram record/reproduction optical system is used in optical information accumulation layer recoding/reproduction information; Control module, be used for the optical information accumulation layer is divided stratification format region and user data area, before data are recorded in user data area, layer format region and user data area are divided into the virtual level that is arranged in different depth in the described optical information accumulation layer, and control and write down the layer information that is used to distinguish virtual level in described hologram record/reproduction optical system each virtual level in layer format region.
Will be in ensuing description part set forth the present invention other aspect and/or advantage, some will be clearly by describing, and perhaps can learn through enforcement of the present invention.
Description of drawings
By the description of exemplary embodiment of the present invention being carried out below in conjunction with accompanying drawing, above-mentioned and/or others of the present invention and advantage will become obvious and easier to understand, wherein:
Fig. 1 schematically shows the structure according to the holographic optical disk of exemplary embodiment of the present invention;
Fig. 2 is illustrated schematically in the record mark (hologram) that interference between the reference beam and signal beams forms in the optical information accumulation layer of CD shown in Figure 1;
Fig. 3 A to Fig. 3 D illustrates the optical information accumulation layer according to the CD of exemplary embodiment of the present invention;
Fig. 4 A and Fig. 4 B illustrate the moving between the recording of information/recording section of reproduction period focus at CD according to exemplary embodiment of the present invention;
Fig. 5 schematically shows the structure according to the holographic recording/reproduction optical system of exemplary embodiment of the present invention;
Fig. 6 schematically shows the light path of servo beam in the servo optical system of holographic recording/reproduction optical system shown in Figure 5;
Fig. 7 schematically shows the light path of signal beams under the logging mode of holographic recording/reproduction optical system shown in Figure 5; And
Fig. 8 schematically shows the light path of reference beam under the recoding/reproduction pattern of holographic recording/reproduction optical system shown in Figure 5.
Embodiment
Now will be in detail with reference to the exemplary embodiment of this instruction, its example is shown in the drawings, and wherein, identical label is represented identical parts all the time.Below by exemplary embodiment being described with reference to the drawings to explain the each side of this instruction.
Fig. 1 schematically shows the structure according to the holographic optical disk 10 of the exemplary embodiment of this instruction, and Fig. 2 is illustrated schematically in the record mark (hologram) that the interference between the reference beam and signal beams forms in the optical information accumulation layer of CD 10.
With reference to Fig. 1, CD 10 comprises: substrate 14; Substrate 15; Reflectance coating 11 is used to reflect the first light beam Lr1 with first wavelength; Reflection/transmission film 12 is used for the second light beam Lr2 that transmission first light beam Lr1 and reflection have second wavelength; And optical information accumulation layer 13.The first light beam Lr1 can be red, and can be called as incident servo beam Lr1 or servo beam Lr1.The second light beam Lr2 can be blue, and can be called as the servo beam Lr2 or the servo beam Lr2 of reflection.Although optical information accumulation layer 13 can comprise a plurality of recording sections, optical information accumulation layer 13 does not comprise and is used for the reflectance coating that recording section is distinguished from each other from physically.For example, optical information accumulation layer 13 can be made by the photosensitive material that can carry out holographic recording.
In Fig. 1, Lb1 is meant the reference beam that focuses at focal point F b, and is projected onto reflection/transmission film 12.Lb3 is meant the reference beam that reflects to form by reference beam Lb1.Lb2 is meant the signal beams that focuses at focal point F b after 12 reflections of reflection/transmission film, the Lb4 indication is at the reflected signal light beam by radiation after the focal point F b.
Be similar to traditional compact disk (CD), digital versatile disc (DVD) or Blu-ray disc (BD), CD 10 diameters are for for example 120mm and be formed centrally a hole therein. Substrate 14 and 15 is used to protect optical information accumulation layer 13 and reflectance coating 11. Substrate 14 and 15 can be made by polycarbonate, glass etc.
Optical information accumulation layer 13 can be made by the photopolymer with the refractive index that changes according to the intensity that is radiated the light beam on it.Accumulation layer 13 can be that the blue light beam of about 405nm reacts with for example having wavelength.When each other during interference, as shown in Figure 2, on optical information accumulation layer 13, forming record mark as the reference beam Lb1 of blue light beam and signal beams Lb2.Record mark can be called as microhologram.Substrate 14 and 15 can have the refractive index identical with the refractive index of optical information accumulation layer 13 usually.
Optical information accumulation layer 13 has the thickness d 2 greater than the height of record mark.For example, optical information accumulation layer 13 can have the thickness that is approximately 150 μ m.In Fig. 1, d1 represents the thickness of substrate 14, and d3 represents the minimum thickness of reflection/transmission film 12.
In optical information accumulation layer 13, form the single recording section that interference figure forms by using signal beams Lb2 and reference beam Lb1.Can form other recording section by changing the degree of depth that forms interference figure in the recording layer 13.
In reflectance coating 11, what can form that base station, groove or pit realize servo beam seeks rail and focusing.Particularly, by reflectance coating 11 basad 14 reflection servo beam Lr1, to form servo beam Lr2.
Reflection/transmission film 12 is wavelength selectivity reflectance coatings of transmits red servo beam and reflection blue servo beam.Reflection/transmission film 12 can be a cholesteric liquid crystal layer, to carry out circularly polarized beam separation operation.Cholesteric liquid crystal layer has the selective reflecting characteristic, wherein, when the sense of rotation (dextrorotation or left-handed) of the spiral of liquid crystal is identical with the direction of circularly polarized light beam, and during the pitch same stages of the wavelength of described light beam and liquid crystal, liquid crystal only reflects circularly polarized beam component.
Signal beams Lb2 after 12 reflections of focal point F b focus reflection/transmission film directly focuses on reference beam Lb1 at focal point F b.At this moment, for example, signal beams Lb2 and reference beam Lb1 can project CD 10 as the light beam of right-hand circular polarization and the light beam of Left-hand circular polarization respectively.Consider this point, for example, reflection/transmission film 12 can reflect the signal beams Lb2 as the blue light beam of right-hand circular polarization, and the reference beam Lb1 as the blue light beam of Left-hand circular polarization of transmission and signal beams Lb2 quadrature.
Fig. 3 A to Fig. 3 D is the diagrammatic sketch according to the optical information accumulation layer 13 of the CD 10 of the exemplary embodiment of this instruction, and is illustrated in recorded information on the optical information accumulation layer 13 or from the processing of optical information accumulation layer 13 information reproductions.In Fig. 3 A to Fig. 3 D, the thickness direction (degree of depth) of focus direction pilot light information storage layer 13 is radially indicated the direction (that is, seeking the rail direction) of crossing the track of CD 10 along the radius of CD 10, and tangential indication is along the circumferencial direction of the track of CD 10.
In recording/reproducing method, layer format region and user data area are set in optical information accumulation layer 13.Optical information accumulation layer 13 also is divided into each virtual level that all is arranged in the different depth of optical information accumulation layer 13.For convenience, the part virtual level that is arranged in layer format region can be called as the form part, and the part virtual level that is arranged in user data area can be called as recording section.In addition, record is used for layer information that virtual level is distinguished from each other in each virtual level (particularly, in the corresponding format part).
Fig. 3 A illustrates layer information is recorded in layer format region is provided with layer format region before in optical information accumulation layer 13 example.Although in two layer format region shown in Fig. 3 A, any amount of layer format region can be set.In addition, can be according to the deviation and the eccentric position of determining layer format region of CD 10.For example, can a layer format region partly be set in the inner circumferential portion and/or the outermost circumference of CD 10.
A layer format region is set, with the different depth recording layer information in optical information accumulation layer 13 in optical information accumulation layer 13.Although be desirably in a plurality of recording section records information,, then may be difficult to the position of controlling recording part if there is not cremasteric reflex film (for example, under the situation of holographic optical disk).
Therefore, in the exemplary embodiment of this instruction, adopt said structure, to make things convenient for the location of recording section.In other words, in layer format region, virtual level is set, and in each virtual level, writes down the layer information of the relative position (degree of depth) that is used to distinguish virtual level.
Fig. 3 B is illustrated in the example that forms barren zone (dummy layer) DL1 and DL2 in layer format region.Before virtual level is set, but but determine the highest recording section and the minimum recording section of optical information accumulation layer 13.For this reason, for example, but but can in the highest recording section of optical information accumulation layer 13 and minimum recording section, barren zone DL1 and DL2 be set.According to the starting position of optical information accumulation layer 13 and end position and optical system nargin (margin) barren zone DL1 and DL2 are set.The starting position and the interval between the end position of barren zone DL1 and DL2 and optical information accumulation layer 13 are more little, and the quantity of the recording section that can form is many more, thereby increase recording capacity.
With reference to Fig. 3 C, form part IL1-IL4 is being set in optical information accumulation layer 13 between barren zone DL1 and the DL2.In format layer IL1-IL4, recording layer information.For recording layer information, recoding/reproduction (record and/or reproduction) optical system is carried out 2 light beam focus controls operation along form part IL1-IL4.In other words, in virtual level, operate in recording layer information in layer format region by using 2 light beam deep focus, and based on the crosstalking next information of determining about the distance between the recording section between the layer.
With reference to Fig. 3 D, in user data area, extend recording section RL1-RL4 from form part IL1-IL4.The layer information that writes down in definite interested virtual level before the record data in recording section RL1-RL4 is then come record data according to the layer information of record by the position of control optical focus.The executive logging not in the position that extends to user data area from barren zone DL1 and DL2.For this reason, can be in barren zone DL1 and DL2 recorded information, will be with indication not at the relevant position of user data area executive logging.Yet, be not that barren zone DL1 and DL2 must be set.Can in the specific range of the starting position of distance optical information accumulation layer 13 and end position, the position of format layer IL1 and format layer IL4 be set, thereby can carry out the information record in the relevant position of user data area.
Before the data that in reproducing record position RL1-RL4, write down, read and the corresponding layer of interested recording section information.Then, according to the layer information that reads, reproduce the data that write down in the recording section by the control optical focus.
Fig. 4 A and Fig. 4 B be according to the exemplary embodiment of this instruction be used to explain for CD 10 at the diagrammatic sketch that move of focus during the recoding/reproduction between recording section.When the degree of depth of optical focus in the CD 10 changes,, in layer format region, carry out moving of optical focus, to prevent the deterioration of optical information accumulation layer 13 in the recording section records data or in order to reproduce the data of record.For example, optical information accumulation layer 13 can be made by photosensitive material, and therefore, the frequency displacement of optical focus may cause the deterioration of optical information accumulation layer 13 in the user data area.In current exemplary embodiment, except user data area also provides a layer format region, and in layer format region the moving of optical focus between the executive logging part, thereby prevent the deterioration of the user data area of CD 10.
Fig. 4 A illustrates moving of optical focus, with by the layer information of service recorder in format layer IL1-IL4 at recording section RL1-RL4 record data.Since not with the corresponding certain customers of barren zone DL1 data area executive logging, therefore optical focus is moved to format layer IL1 according to the information that is recorded among the barren zone DL1.Then, according to the layer information record data in recording section RL1 that are recorded among the format layer IL1.Then optical focus is moved to next format layer IL2, described format layer IL2 is included in the identical virtual level with recording section RL2.
Thereafter, the layer information of reading and recording in format region IL2, and according to the layer information that reads data are recorded among the recording section RL2.Yet the path of the optical focus shown in Fig. 4 A only is illustrative example.For example, if single layer format region only is provided, then in recording section RL1, after the record, optical focus can be retracted the ground floor format region, optical focus is moved to next format layer IL2 and recorded information in next format layer IL2.In addition, for example, the format information that is included in first virtual level can be used for focus is directed to second virtual level.
Fig. 4 B illustrates the mobile route of optical focus, is used for reproducing the information that recording section RL1-RL4 writes down.Since with the corresponding certain customers of barren zone DL1 data areas on do not have record data, therefore optical focus is moved to form part IL1 according to the information that writes down among the barren zone DL1.Then, by reproducing the data that write down among the recording section RL1 according to the layer information Control optical focus that writes down among the form part IL1.Then in second layer format region, optical focus moved to the next record part.Thereafter, the layer information that writes down among the reading format part IL2, and according to the data that write down among the information regeneration recording section RL2 that reads.Yet the mobile route of the optical focus shown in Fig. 4 B only is illustrative example.For example, if single layer format region only is provided, then after recording section RL1 reproduces, optical focus can be retracted a layer format region, optical focus is moved to next form part IL2.
The CD that is used to have the optical information accumulation layer according to the recording/reproducing apparatus of the exemplary embodiment of this instruction.Described equipment comprises: holographic recording/reproduction optical system is used in optical information accumulation layer recorded information or from optical information accumulation layer information reproduction; Control module is used to control holographic recording/reproduction optical system.
Control module is divided into layer format region and user data area with the optical information accumulation layer, and the optical information accumulation layer of specifying different depth is as virtual level, and described virtual level comprises the form part in layer format region.Control module control holographic recording/reproduction optical system is before the virtual level that data is recorded in the user data area, and record is used for layer information that virtual level is distinguished from each other in each form part.
Fig. 5 schematically shows holographic recording/reproduction optical system.For example, holographic recording/reproduction optical system can be carried out the recoding/reproduction processing of describing with reference to Fig. 3 A to Fig. 4 D.
With reference to Fig. 5, holographic recording/reproduction optical system comprises: servo optical system 70, the light path of formation servo beam; Object lens 100 carry out optically focused with recorded information on CD 10 or from CD 10 information reproductions to light beam; Signal beams optical system 50 is radiated signal beams Lb2 on the CD 10; And reference beam optical system 20, during the information recording/regenerating reference beam Lb1 is being radiated on the CD 10.To the detailed structure of servo optical system 70, signal beams optical system 50 and reference beam optical system 20 respectively with reference to Fig. 6 to Fig. 8 be described thereafter.
Fig. 6 schematically shows the light path of servo beam in the servo optical system 70.With reference to Fig. 6, servo optical system 70 can be radiated first light beam (that is, red servo beam Lr1) from first light source 71 on the CD 10, and collects from the servo beam Lr2 of reflectance coating 11 reflections.
First light source 71 can be launched servo beam Lr1, and for example, described servo beam Lr1 can have the wavelength of about 660nm.By grating 72 servo beam Lr1 is divided into main beam and 2 beamlets.Servo beam Lr1 (main beam) passes through collimation lens 74 after polarization beam splitter 73 is passed through in transmission.
For optimizing object lens 100 according to relation (such as the optical range between correcting lens 75 and the object lens 100) from second light beam (that is holographic recording/reproduction blue light beam) of secondary light source 21 emissions and the servo beam Lr1 that focuses on the reflectance coating 11.For servo beam Lr1, for example, object lens 100 can be used as numerical aperture and are approximately 0.63 collector lens.
Successively by object lens 100, QWP 43, mirror 42, dichroic prism 40 and 41 and correcting lens 75 after the servo beam Lr2 of reflection be polarized, and by collimation lens 74 by optically focused.Then polarization beam splitter 73 reflects the servo beam Lr2 of reflection to first fluorescence detector 79.Astigmatic lens (for example, cylindrical lens 78) can also be set, with according to astigmatism method focus servo light beam Lr2 between the polarization beam splitter 73 and first fluorescence detector 79.
Owing to deviation and/or off-centre may occur in the CD 10, therefore target track and focal position may change.Therefore, servo optical system 70 with the corresponding focus focus servo of target track light beam Lr1.For this reason, respectively with the thickness direction of CD 10 and the corresponding focus direction of radial direction with seek rail direction shift servo light beam Lr1.
Can be via driver element 44 in focus direction with seek rail direction shift servo light beam Lr1.Driver element comprises along focus direction and seeks 2 shaft actuators that the rail direction drives object lens 100.Driver element 44 is included in inclined radial and focus direction and seeks 3 shaft actuators that the rail direction drives object lens 100.
Although do not have shown in Figure 6ly, for detection of focus error signal and seek the rail error signal, first fluorescence detector 79 can comprise: have the main optical detecting device of light beam receiving area Ar, Br, Cr and Dr, be used to receive main beam; And in two light beam receiving areas with the radial direction of being arranged in of main optical detecting device both sides (Er, Fr) and (Hr, first secondary fluorescence detector Gr) and the second secondary fluorescence detector are used to receive beamlet.
Can carry out focus control with astigmatism method by the signal that uses the main optical detecting device to detect.Can come based on the main beam detection signal that the main optical detecting device receives to obtain focus error signal FESr by following equation 1.Focus error signal FESr is input to the control module (not shown), to be used for the focus control of object lens 100.In the following description, explain for convenience, will be by the light beam receiving area of identical symbolic representation fluorescence detector and the signal that detects from the light beam receiving area.
FESr＝(Ar+Cr)-(Br+Dr) (1)
Can carry out with the differential push-pull method and seek rail control by using the signal of the first secondary fluorescence detector and the second secondary fluorescence detector detection.Use the bias that rail error signal DPPr represents servo beam Lr1 and target track of seeking of differential push-pull method acquisition, and can obtain by following mode:
MPPr＝(Ar+Dr)-(Br+Cr)
SPPr1＝Er-Fr
SPPr2＝G1-Hr
DPPr＝MPPr-k(SPPr1+SPPr2) (2)
Wherein, k represents gain.
Like this, servo optical system 70 is radiated servo beam Lr1 on the reflectance coating 11 of CD 10, and uses the servo beam Lr2 of reflection to carry out the focus control of object lens 100 and seek rail control.
Fig. 7 is illustrated schematically in the light path of signal beams under the logging mode of holographic recording/reproduction optical system shown in Figure 5.Fig. 8 is illustrated schematically in the light path of reference beam under the recoding/reproduction pattern of holographic recording/reproduction optical system shown in Figure 5.
With reference to Fig. 7 and Fig. 8, secondary light source 21 sends second light beam (for example, blue light beam Lb) that wavelength is approximately 405nm.Blue light beam Lb passes through collimation lens 22, and is converted into parallel beam.Parallel blue light beam Lb is by active half-wave plate 26, and polarization beam splitter 27 is with its reflection and transmission.At this, the reflecting part of blue light beam forms signal beams Lb2, and the transmissive portions of blue light beam divides formation reference beam Lb1.
Active half-wave plate 26 is ON/OFF type half-wave plates of operating as half-wave plate when electric current applies on it.Therefore, when electric current was applied to half-wave plate 26, half-wave plate was with the polarization direction rotation predetermined angular of incident blue light beam Lb, thus polarization beam splitter 27 reflected signal light beam Lb2, and polarization beam splitter 27 transmission reference beam Lb1.
At this, suppose active half-wave plate 26 during reproduction mode as half-wave plate operation, during reproduction mode, do not apply electric current to active half-wave plate 26.Therefore, during logging mode, blue light beam Lb (for example, P polarization blue light beam Lb's is whole or most of) transmission is by polarization beam splitter 27, and blue light beam Lb propagates along the light path of reference beam Lb1.
Active half-wave plate 26 can comprise rotating driving device, thus the rotatable predetermined angular in polarization direction, to adjust the intensity distributions of S light beam and P light beam.Polarization beam splitter 27 is divided blue light beam Lb to half, to form reference beam Lb1 and signal beams Lb2.Division ratio can be adjusted by active half-wave plate 26.
Current mirror (Galvano mirror) 51 reflection S polarization signal light beam Lb2, then half-wave plate 52 converts S polarization signal light beam Lb2 to P polarization signal light beam.By after the polarization beam splitter 53, P polarization signal light beam converts circularly polarized light beam to by QWP 54 in transmission, then by mirror 55 reflections.QWP sheet 54 converts the signal beams Lb2 of reflection to the S light beam.After being polarized beam splitter 53 reflections, the S light beam is transmitted to current mirror 56. Current mirror 51 and 56 angles according to the control break folded light beam of control module (not shown), and can adjust the light path of signal beams Lb2.
The signal beams Lb2 of current mirror 56 reflections passes through slit 57, and is projected onto beam expander 58.Beam expander 58 can comprise removable lens 59 and 60.Removable lens 59 are dispersed signal beams Lb2, and removable lens 60 are collected signal beams Lb2.Then, signal beams Lb2 passes through relay lens 61, and is projected onto half-wave plate 64, to be converted into the P light beam.
Move removable lens 59 by stepper motor or piezoelectric motor at optical axis direction.Move removable lens 60 by the actuator similar at optical axis direction to the actuator of the driver element 44 of object lens 100.Compare with removable lens 59, can control removable lens 60 more subtly.The displacement of removable lens 59 can be greater than the displacement of removable lens 60.
P polarization signal light beam Lb2 passes polarization beam splitter 38 from half-wave plate 64 transmissions, then propagates into active half-wave plate 46.The polarization direction of P polarization signal light beam Lb2 by the 46 rotation incidents of active half-wave plate, thus P polarization signal light beam Lb2 is converted into and mainly comprises S light beam component.P polarization signal light beam Lb2 can be converted into by active half-wave plate 46 and comprise about 70% S light beam component and about 30% P light beam component.
Signal beams Lb2 passes through focal point F b, and is returned the signal beams Lb4 of object lens 100 as reflection by radiation.The signal beams Lb4 of this reflection is converted into the S light beam by QWP 43, and after by mirror 42, dichroic prism 41 and mirror 45 reflections, propagates into active half-wave plate 46.By the reflected signal light beam Lb4 of active half-wave plate 46 conversion S polarizations, to comprise for example about 30% S light beam component and about 70% P light beam component.By polarization beam splitter 38 reflection S light beam components.The reflected signal light beam Lb4 transmission of the S polarization of reflection arrives beam expander 32 by relay lens 35.The signal beams Lb4 of this reflection is converted into the P light beam by half-wave plate 31, and polarization beam splitter 28 is passed through in transmission, and passes through collector lens 49 by optically focused.Then, cylindrical lens 47 produces astigmatism, and receives the signal beams Lb4 of reflection by second fluorescence detector 48.
Owing to deviation or off-centre may occur in the CD 10, therefore target track and focal position may change.Therefore, as mentioned above, use red servo beam and control module (not shown) to focus on and seek rail by servo optical system control.Yet signal beams Lb2 may be owing to the focal point F b that departs from reference beam Lb1 that moves of object lens 100.Therefore, signal beams optical system 50 is used second fluorescence detectors 48 and based on the amount of signal beams Lb2 off-focal Fb, by the accepting state of reflection reflected signal light beam Lb4, is adjusted the optical position of various opticses.
In order under logging mode, to carry out the focusing of signal beams Lb2 and to seek rail control, second fluorescence detector 48 can comprise 4 light beam receiving area Ab, Bb, Cb and Db, and second fluorescence detector 48 uses these 4 light beam receiving area Ab, Bb, Cb and Db to come detected reflectance signal light beam Lb4.The signal processing unit (not shown) uses astigmatism method to carry out focus control, detection signal based on light beam receiving area Ab, Bb, Cb and Db uses following equation 3 to calculate focus error signal FESb, and focus error signal FESb is offered control module.
FESb＝(Ab+Cb)-(Bb+Db) (3)
Focus error signal FESb represents the difference amount between the focus of the focal point F b of reference beam Lb1 on the focus direction and signal beams Lb2.
By using push-pull signal and seeking rail error signal RPPb execution and seek rail control, seek rail error signal RPPb by 4 calculating of following equation and then provide it to control module.
RPPb＝(Ab+Db)-(Bb+Cb) (4)
Seek rail error signal RPPb and represent to seek difference amount between the focus of the focal point F b of reference beam Lb1 on the rail direction and signal beams Lb2.
Also can produce the tangential error signal TPPb that is used for tangential control by following equation 5.The tangential direction that tangential control is included in CD 10 navigates to signal beams Lb2 the focal point F b of reference beam Lb1.
TPPb＝(Ab+Bb)-(Cb+Db) (5)
Tangential error signal TPPb represents the difference amount between the focus of the focal point F b of reference beam Lb1 on the tangential direction of CD 10 and signal beams Lb2.
Control module produces focus drive signal based on focus error signal FESb, and focus drive signal is offered for example removable lens 60 of beam expander 58, thereby removable lens 60 are carried out focus control.Carry out focus control with the difference amount between the focus of the focal point F b that reduces reference beam Lb1 on the focus direction and signal beams Lb2.Control module also produces and to seek the rail drive signal based on seeking rail error signal RPPb, and will seek the rail drive signal and offer for example current mirror 56, seeks rail control thereby current mirror 56 carried out.Seek rail control and be used to reduce difference amount between the focus of the focal point F b that seeks reference beam Lb1 on the rail direction and signal beams Lb2.
Control module also produces tangential drive signal based on tangential error signal TPPb, and tangential drive signal is offered for example current mirror 51, thereby current mirror 51 is carried out tangential control.Tangential control is used to reduce the difference amount between the focus of the focal point F b of reference beam Lb1 on the tangential direction and signal beams Lb2.
Like this, signal beams optical system 50 is radiated CD 10 with signal beams Lb2, receives reflected signal light beam Lb4 from reflection/transmission film 12 (see figure 1)s, and reception result is offered signal processing unit.The control module of signal beams optical system 50 is carried out focus control to beam expander 58 and relay lens 61, current mirror 51 is carried out tangential control, and rail control is sought in 56 execution to current mirror, thereby forms the focus of signal beams Lb2 at the focal point F b of reference beam Lb1.
With reference to Fig. 8, in reference beam optical system 20, the blue light beam Lb that sends from secondary light source 21 is converted into parallel beam by collimation lens 22.Owing to pass active half-wave plate 26, blue light beam Lb comprises S light beam component and P light beam component.The S light beam component of polarization beam splitter 27 reflection blue light beam Lb, and the S light beam component of blue light beam Lb is used as signal beams Lb2 as mentioned above.
The P light beam component transmission-polarizing beam splitter 27 of blue light beam Lb, and as reference beam Lb1.Reference beam Lb1 propagates into polarization beam splitter 28.P polarization reference light beam Lb1 transmission is converted into the Left-hand circular polarization light beam by polarization beam splitter 28 by QWP 29, is reflected by mirror 30, then is converted into the S light beam by QWP 29.Then, S polarization reference light beam Lb1 is polarized beam splitter 28 reflections, and propagates to half-wave plate 31.S polarization reference light beam Lb1 is converted into the P light beam by half-wave plate 31, then propagates into beam expander 32.
Reference beam optical system 20 comprises flexible mirror 30.Mirror 30 can change the optical path length of reference beam Lb1, with the optical path length of matched signal light beam Lb2.For this reason, the mirror 55 of driver enable signal beam optical system 50 perhaps can drive mirror 55 and mirror 30.When the laser diode of the coherence distance with about hundreds of micron is used as secondary light source 21, if the difference between the optical path length of reference beam Lb1 and signal beams Lb2 surpasses this coherence distance, then can not form good record mark in the focus of reference beam Lb1 and signal beams Lb2.In order to form good hologram, must the difference between the optical path length be adjusted to below the coherence distance by control example such as mirror 30.
P polarization reference light beam Lb1 propagates into beam expander 32, and in beam expander 32, removable lens 33 are beam spread, follows removable lens 34 light beam is assembled again.Then reference beam Lb1 passes relay lens 35 and propagates into polarization beam splitter 38.Because this reference beam Lb1 is aforesaid P light beam, so reference beam Lb1 transmission propagates into dimmer 39 by polarization beam splitter 38.
According to relation (such as the optical range between beam expander 32 and the object lens 100), object lens 100 can be used as the collector lens that for example has about 0.65 numerical aperture and operate.At this, the numerical aperture of object lens 100 that is used for reference beam Lb1 is bigger than the numerical aperture of the object lens 100 that are used for signal beams Lb2.This be because reference beam Lb1 by object lens 100 by optically focused, then be focused focal point F b immediately, and signal beams Lb2 by object lens 100 by optically focused, then be reflected/transmission film 12 (see figure 1)s are focused focal point F b after reflecting.Therefore, the focusing distance of signal beams Lb2 is greater than the focusing distance of reference beam Lb1.Yet this instruction is not limited to these features.
During writing down, the part of reference beam Lb1 is being reflected/reflection of transmission film 12 (see figure 1)s after the very difficult object lens 100 that return again.Reflection/transmission film 12 (see figure 1)s mainly only reflect the right-hand circular polarization light beam, therefore are not reflected into the reference beam Lb1 that is mapped to CD 10.
Under the reproduction mode, active half-wave plate 26 is closed, and does not operate as half-wave plate, sends P polarization blue light beam Lb from secondary light source 21, and this P polarization blue light beam Lb is not polarized by active half-wave plate 26.By after the polarization beam splitter 27, blue light beam Lb propagates along the light path of the reference beam Lb1 that logging mode uses down in transmission.Because the blue light beam Lb that uses under the reproduction mode is identical with the reference beam Lb1 that logging mode uses down, therefore supposes that blue light beam Lb is reference beam Lb1.
When the record mark (that is, hologram) that writes down in the optical information accumulation layer of reproducing CD 10, the reference beam (hereinafter referred to as reconstruction beam) that will be used for reconstructing hologram propagates into object lens 100.Reference beam Lb1 is propagated into CD 10 as the Left-hand circular polarization light beam.The reconstruction beam of hologram reflection is the right-hand circular polarization light beam, and reason is that only its direction of propagation changes, and the sense of rotation of electric field intensity does not change.The right-hand circular polarization reconstruction beam by mirror 42, dichroic prism 41 and mirror 45 reflections, then propagates into active half-wave plate 46 successively after being converted to the S light beam by QWP 43.
Because active half-wave plate 46 is not operated as half-wave plate at reproduction period, so S polarization reconstruction beam is by active half-wave plate 46 and without polarization.After S polarization reconstruction beam was polarized beam splitter 38 reflections, S polarization reconstruction beam propagated into relay lens 35.Then S polarization reconstruction beam is converted into parallel beam by beam expander 32.After being converted into the P light beam by half-wave plate 31, the light beam transmission is by polarization beam splitter 28.The P polarization reconstruction beam that obtains is by collector lens 49 optically focused, and after this, P polarization reconstruction beam passes through cylindrical lens 47, and is received by second fluorescence detector 48.From the reproducing signal that second fluorescence detector 48 detects, can determine the record mark hologram information of record in the booking situation part.
The information record that execution as described below is undertaken by recording/reproducing apparatus.Servo optical system 70 is radiated servo beam Lr1 on the CD 10, and based on the testing result of the servo beam Lr2 that reflects from reflectance coating 11 object lens 100 are carried out focus controls and sought rail control, and the focal point F r of control servo beam Lr1, to follow target track.
Signal beams optical system 50 is by the controlled object lens 100 in control position, and blue signal light beam Lb2 is radiated CD 10 and the focus of signal beams Lb2 is navigated to target track.The corresponding target depth with focal point F b is adjusted in the position of the removable lens 59 by adjusting beam expander 58, thereby blue signal light beam Lb2 is navigated to focal point F b.
Reference beam optical system 20 is radiated reference beam Lb1 on the CD 10, adjusts the position of the removable lens 33 of beam expander 32, and control dimmer 39 passes through to allow reference beam Lb1.Thereby reference beam Lb1 is navigated to focal point F b.
At this, the light beam that receives by the fluorescence detector 25 that detects the front is adjusted the recording power of secondary light source 21.A part of separating the light beam that secondary light sources 21 send by beam splitter 23, and after the part of described light beam is by condenser 24 optically focused is received by the fluorescence detector 25 of front.
Signal beams Lb2 may be owing to the deviation and the eccentric focal point F b that departs from expectation of CD 10.Consider this possibility, can tangentially control and seek rail control to current mirror 51 and current mirror 56 execution, the removable lens 60 of beam expander 58 are carried out focus controls based on the testing result of reflected signal light beam Lb4.
When reference beam Lb1 and signal beams Lb2 when focal point F b mixes, moving lens 30 is to adjust to the difference between the optical path length of reference beam Lb1 and signal beams Lb2 below the coherence distance.Like this, can write down good record mark.
When the recorded information in recording section described with reference to Fig. 3 A to Fig. 3 D as the front, the control module (not shown) is divided into layer format region and user data area with the optical information accumulation layer, the position of specifying the different depth (on the thickness direction) in the optical information accumulation layer is as virtual level, and before data are recorded in user data area, control holographic recording/reproduction optical system recording layer information in each virtual level.The executivecontrol function of control module (not shown), thus the focus between the executive logging part moves in layer format region.
The information regeneration that execution as described below is undertaken by recording/reproducing apparatus.Servo optical system 70 is radiated servo beam Lr1 on the CD 10, and based on the testing result of the servo beam Lr2 that reflects from reflectance coating 11 object lens 100 are carried out focus controls and sought rail control, and the focal point F r of control servo beam Lr1, to follow target track.
Reference beam optical system 20 is radiated reference beam Lb1 on the CD 10.100 couples of reference beam Lb1 of the object lens of location-controlled carry out optically focused, and the focal point F b of reference beam Lb1 is navigated to target track.In addition, the removable lens 33 of beam expander 32 are carried out rough control, and removable lens 34 are carried out meticulous control, thereby adjust the position of the focal point F b of reference beam Lb1.
Because as half-wave plate operation, therefore whole the or major part of the blue light beam Lb that sends from secondary light source 21 becomes reference beam Lb1 to active half-wave plate 26, thereby has improved reproduction efficient when not being applied in electric current.Active half-wave plate 26 passes through it according to the operation transmission reference beam Lb1 of dimmer 39.
Lb1 is radiated record mark with reference beam, produces reconstruction beam by this record mark.Second fluorescence detector 48 detects this reconstruction beam, to obtain reproducing signal.At this, when active half-wave plate 46 is not activated, can improve the reconstruction beam receiving efficiency.
When the information that writes down in a plurality of recording sections that reproduce CD 10, holographic recording/reproduction optical system according to the corresponding format layer of recording section in the layer information Control optical focus that writes down and reproduce the information that writes down in the recording section.The executivecontrol function of control module (not shown), thus the light beam between the executive logging part moves in layer format region.
Although shown and described exemplary embodiments more of the present invention, but it should be appreciated by those skilled in the art that, without departing from the principles and spirit of the present invention, can carry out various changes in these embodiments, scope of the present invention is limited by claim and equivalent thereof.
Claims (15)
1, a kind of CD that comprises the optical information accumulation layer comprises:
Be arranged in the virtual level of different depth in the described optical information accumulation layer;
Layer format region; And
User data area,
Wherein, virtual level has the layer information that being used for of writing down is distinguished from each other virtual level in layer format region.
2, CD as claimed in claim 1 wherein, forms the optical information accumulation layer by the photosensitive material that can carry out holographic recording.
3, CD as claimed in claim 1 also comprises: a plurality of layers of format region.
4, CD as claimed in claim 3 wherein, partly is provided with described a plurality of layers of format region in the inner circumferential portion and the outermost circumference of CD.
5, CD as claimed in claim 1 also comprises: be arranged in the topmost portion of layer format region and the barren zone of lowermost part, described barren zone have the indication user data will not be recorded in the corresponding partial record of barren zone zone in information.
6, a kind of disc recording method that is used to comprise the optical information accumulation layer, described recording/reproducing method comprises:
The optical information accumulation layer is divided stratification format region and user data area;
Layer format region and user data area are divided into the virtual level that each all is arranged in different depth in the described optical information accumulation layer; And
Record is used for layer information that virtual level is distinguished from each other in each virtual level in layer format region.
7, recording/reproducing method as claimed in claim 6 wherein, is carried out the division of optical information accumulation layer according to the off-centre of CD.
8, recording/reproducing method as claimed in claim 6, wherein, the step of divided light information storage layer comprises: the optical information accumulation layer is divided into a plurality of layers of format region.
9, recording/reproducing method as claimed in claim 6 also comprises:
The part virtual level of specific arrangements in user data area is as recording section, and the part virtual level of specific arrangements in layer format region is as the form part; And
By data being recorded in recording section according to layer information Control optical focus with the corresponding virtual level of each recording section.
10, recording/reproducing method as claimed in claim 9 also comprises: reproduce data by basis with the layer information Control optical focus of the corresponding virtual level of each recording section.
11, recording/reproducing method as claimed in claim 9 wherein, when the different depth that optical focus moved in the optical information accumulation layer, is carried out described moving in layer format region.
12, a kind of disc recording equipment that is used to comprise the optical information accumulation layer, described recording/reproducing apparatus comprises:
Hologram record/reproduction optical system is used for the information that records the information in the optical information accumulation layer and be used to reproduce record; And
Control module, be used for the optical information accumulation layer is divided stratification format region and user data area, layer format region and user data area are divided into the virtual level that each all is arranged in different depth in the described optical information accumulation layer, and control described hologram record/reproduction optical system, so that record is used for layer information that virtual level is distinguished from each other in described hologram record/reproduction optical system each virtual level in layer format region.
13, recording/reproducing apparatus as claimed in claim 12, wherein, hologram record/reproduction optical system by according to and the corresponding layer of virtual level information Control optical focus data are recorded in the virtual level in the user data area.
14, recording/reproducing apparatus as claimed in claim 13, wherein, in each virtual level, hologram record/reproduction optical system is by reproducing the data of record according to the layer information Control optical focus of respective virtual layer.
15, recording/reproducing apparatus as claimed in claim 13 wherein, when hologram record/reproduction optical system changes the degree of depth of optical focus in the optical information accumulation layer, is arranged described focus in layer format region.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020080089330 | 2008-09-10 | ||
| KR1020080089330A KR100982520B1 (en) | 2008-09-10 | 2008-09-10 | Optical disc, recording/reproducing method and apparatus for the optical disc |
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| Publication Number | Publication Date |
|---|---|
| CN101673562A true CN101673562A (en) | 2010-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910002289A Pending CN101673562A (en) | 2008-09-10 | 2009-09-09 | Optical disc and recording/reproducing method and apparatus for the optical disc |
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| Country | Link |
|---|---|
| US (1) | US20100061210A1 (en) |
| EP (1) | EP2164067A1 (en) |
| JP (1) | JP2010067339A (en) |
| KR (1) | KR100982520B1 (en) |
| CN (1) | CN101673562A (en) |
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| JP4437760B2 (en) * | 2005-03-15 | 2010-03-24 | 三菱電機株式会社 | optical disk |
| KR20100048691A (en) * | 2008-10-31 | 2010-05-11 | 삼성전자주식회사 | Method and apparatus for control of data recording location |
| JP2011070752A (en) * | 2009-09-28 | 2011-04-07 | Sanyo Electric Co Ltd | Optical pickup device |
| US8520483B2 (en) | 2010-07-29 | 2013-08-27 | General Electric Company | Method and system for processing information from optical disk layers |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5303225A (en) * | 1989-10-30 | 1994-04-12 | Matsushita Electrical Industrial Co., Ltd. | Multi-layered optical disk with track and layer identification |
| JPH09259470A (en) * | 1996-03-21 | 1997-10-03 | Toshiba Corp | Laminated information recording medium |
| JP2002050053A (en) * | 2000-08-01 | 2002-02-15 | Tdk Corp | Optical information medium |
| JP2002329331A (en) * | 2001-04-27 | 2002-11-15 | Toshiba Corp | Information recording medium, information reproducing device, and information reproducing method |
| US6738324B2 (en) * | 2001-05-29 | 2004-05-18 | Matsushita Electric Industrial Co. | Recording and/or reproduction apparatus |
| US7428205B2 (en) * | 2002-11-27 | 2008-09-23 | General Electric Company | Multi-layer holographic data reading method |
| KR100669631B1 (en) * | 2004-06-30 | 2007-01-15 | 엘지전자 주식회사 | Recording medium, apparatus and method for reproducing recording medium |
| JP2007026617A (en) * | 2005-07-21 | 2007-02-01 | Toshiba Corp | Information storage medium, recording method, reproducing method, and apparatus |
| JP2007066404A (en) | 2005-08-30 | 2007-03-15 | Fujifilm Corp | Optical recording method, optical recording apparatus, optical recording medium, and optical recording and reproducing method |
| JP2007066400A (en) * | 2005-08-30 | 2007-03-15 | Fujifilm Corp | Optical recording method, optical recording apparatus, and optical recording medium |
| JP2007094050A (en) * | 2005-09-29 | 2007-04-12 | Sanyo Electric Co Ltd | Holographic recording medium and holographic reproducing apparatus |
| JP2008052793A (en) * | 2006-08-23 | 2008-03-06 | Sharp Corp | Recording medium, servo signal detecting method using the same, and information recording and reproducing apparatus |
| JP4743129B2 (en) * | 2007-01-25 | 2011-08-10 | 船井電機株式会社 | Hologram recording medium, hologram recording method and apparatus, hologram reproducing method and apparatus |
| KR101439846B1 (en) * | 2007-12-12 | 2014-09-12 | 삼성전자주식회사 | Holographic data storage medium, and apparatus and method for recording/reproducing holographic data on/from the same |
-
2008
- 2008-09-10 KR KR1020080089330A patent/KR100982520B1/en not_active IP Right Cessation
-
2009
- 2009-08-26 US US12/547,826 patent/US20100061210A1/en not_active Abandoned
- 2009-08-31 EP EP09169087A patent/EP2164067A1/en not_active Withdrawn
- 2009-09-09 JP JP2009207972A patent/JP2010067339A/en active Pending
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| JP2010067339A (en) | 2010-03-25 |
| KR100982520B1 (en) | 2010-09-16 |
| KR20100030395A (en) | 2010-03-18 |
| US20100061210A1 (en) | 2010-03-11 |
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